Improved process of tempering metals



` To all whom t't ma/y `concern lnitsd iates i para aan.

` EDWIN' GRANT, OF WASINGTOND, D'Isfrnrc'r or COLUMBIA( Leners Patent No, 90,093, dated May 1s, 1869.

nurnovun rnocess or' TEMPERING Mm-ALS.

\ The Schedule referred to in these Letters :Eatent and making part of the same( Be it known that 1,EDWIN EGRANT, of Washington, in the District of ,-Columbia, have discovered and invented a new and useful Process for Tempel-ing Metals, which consists inthe useof a current of steam,

l as will be `hereinafter described; and I do hereby de-` l clare`that the following is a.' full, clear, and exact description thereof, reference being had to the accompa- 'nying drawing, and to the letters of reference marked thereon, and being a part of this specification, saiddrawing showing one method of applying -my process.

` Figure 1 is a plan view of my apparatus, used inI said method of applying my process. 4

Figure? is a vertical section of the same portions of my apparatus which are `shown in lig. 1.` This view represents a section cut through the lines a: x, shown on fig. 1.

p' The same letters indicate like parts in each figure.

The object of my invention isthe tempering of ,p metals, or the hardening of their surfaces by cooling them rapidly, by means of an apparatus so constructed l as to conduct steam by suitable pipes from a steamgenerator, orfronrpipcs connecting With'it to a steamchest, or enclosure, so constructed as to receive the ,heated metal, or such parts of Vit as are to be tempered,`and to allow the passageof a jet or current of `steam to pass freely in ,y actual contact with Aand vover `the surface ofthe metal to be tempered, and thenv to y `escape from such enclosure.

To enable 4others skilled in the art to use my process, and `to make the necessary apparatus, I will proceed to describe the construction and operation ofthe apparatus used in the methodof applying nry process,

referred to in thc-accompanying drawing. y

I construct a steam-chest, orenclcsure A, in any of the known forms, andof any of the known materials suitable for such purpose, and apply thereto one or more inductionpipes B B, which connect with the steam-generator D, orwithpipes leading from it.` j

These induction-pipes yare furnished with` any valves or stop-cocks G O, now in` use, and not covered by Letters Patent. r

\ I also apply to the enclosure A an eduction-pipe, or opening E.

Within the enclosure A, I place the surface of 'the K heated metal F which is to be tempered. f

The apparatus being then ready for use, I let into the enclosure A, a jet, or current of steam, through l the induction-pipes B B, by means of the valves, or

vstock-cocks O C, from the generator D, or from itsl connecting-pipes, and cause this jet, or current of steam to pass in close and actual contact with the snr face of the heated metal F, .and escape from the enclosure A through the eduction-pipe', or opening E.

It. is apparent that a current of steam, in passing 'from a generator through a steambhestyor enclosure,

and `over the `surface of a mass 0f heated metal enclosed therein, will take up and carry away the heat from the surface of such metal with rapidity It is also apparent that the rapidity of this convection of heat will be governed by the 'bulk,.tempera ture, and nature of the metal, and by the bulk, temlperaturc, force of current, and nearness of contact of the steam passing over its surface and through `such or opening E, forthe uses and purposes substantially as described.

EDWIN H. GRANT.

y Witnesses:

CRAs. C. ADAMs, t.. ALBERT CLARK. 

